31900937940 has 96 divisors (see below), whose sum is σ = 100472776320. Its totient is φ = 8506905120.

The previous prime is 31900937933. The next prime is 31900937941. The reversal of 31900937940 is 4973900913.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31900937941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320926 + ... + 408405.

It is an arithmetic number, because the mean of its divisors is an integer number (1046591420).

Almost surely, 2^31900937940 is an apocalyptic number.

31900937940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31900937940 is an abundant number, since it is smaller than the sum of its proper divisors (68571838380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31900937940 is an equidigital number, since it uses as much as digits as its factorization.

31900937940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729361 (or 729341 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The spelling of 31900937940 in words is "thirty-one billion, nine hundred million, nine hundred thirty-seven thousand, nine hundred forty".